diff --git a/SharpPcap/WinDivert/WinDivertPacketFlags.cs b/SharpPcap/WinDivert/WinDivertPacketFlags.cs
index b4edcd5a..fa26bef8 100644
--- a/SharpPcap/WinDivert/WinDivertPacketFlags.cs
+++ b/SharpPcap/WinDivert/WinDivertPacketFlags.cs
@@ -2,8 +2,11 @@
 //
 // SPDX-License-Identifier: MIT
 
+using System;
+
 namespace SharpPcap.WinDivert
 {
+    [Flags]
     public enum WinDivertPacketFlags : byte
     {
         Sniffed = 1 << 0,